PLS-00306: wrong number or types of arguments in call to

问题

I'm invoking an Oracle function from a .NET application and I always get following exception: PLS-00306: wrong number or types of arguments in call to 'TF_GETNODES'

Here is the definition of the Oracle function:

FUNCTION "IMPACTNET"."TF_GETNODES"
(
    DIMENSIONKEY  IN NVARCHAR2,
    PARENTNODE    IN NVARCHAR2,
    PARASTRING    IN NVARCHAR2
) RETURN IMPACTNET.TREE_NODE_TABLE IS

    treeNodes IMPACTNET.TREE_NODE_TABLE;

BEGIN

    treeNodes:=IMPACTNET.TREE_NODE_TABLE();
    for i in 1..2
    loop
    treeNodes.extend;
    treeNodes(i) := IMPACTNET.TREE_NODE(DIMENSIONKEY || i, PARENTNODE || i, 0, 0, PARASTRING || i, 0);
    end loop;

    RETURN treeNodes;

END;

And here is my .NET code:

var treeNodes = new TreeNodesTable();

using (var connection = CreateConnection())
using (var command = new OracleCommand { Connection = connection, CommandType = CommandType.StoredProcedure, CommandText = "IMPACTNET.TF_GETNODES" })
{
    command.Parameters.Add("DIMENSIONKEY", OracleDbType.NVarchar2, ParameterDirection.Input).Value = "dimension key";
    command.Parameters.Add("PARENTNODE",   OracleDbType.NVarchar2, ParameterDirection.Input).Value = "parent node";
    command.Parameters.Add("PARASTRING",   OracleDbType.NVarchar2, ParameterDirection.Input).Value = "para string";

    var p1 = new OracleParameter
    {
        ParameterName = "treeNodes",
        OracleDbType = OracleDbType.Object,
        UdtTypeName = "IMPACTNET.TREE_NODE_TABLE",
        Direction = ParameterDirection.ReturnValue,
        Value = treeNodes
    };
    command.Parameters.Add(p1);

    connection.Open();
    command.ExecuteNonQuery();

    treeNodes = (TreeNodesTable)p1.Value;
}

回答1:

Like Allan I'm not an ODP expert. However, I do know that Oracle stores the return value of a function as PARAMETER 0 in the Data Dictionary. The input parameters are 1, 2, etc.

So, if you declare and assign the return value before you assign the input parameters it might work.

回答2:

I'm not an expert on the .NET side of things, but it looks to me like you're setting up your UDT as a parameter, rather than as a return value. Try dropping your function and replacing it with the following procedure:

PROCEDURE "IMPACTNET"."TF_GETNODES"
(
    DIMENSIONKEY  IN  NVARCHAR2,
    PARENTNODE    IN  NVARCHAR2,
    PARASTRING    IN  NVARCHAR2,
    treeNodes     OUT IMPACTNET.TREE_NODE_TABLE
) IS
BEGIN
    treeNodes:=IMPACTNET.TREE_NODE_TABLE();
    for i in 1..2 loop
       treeNodes.extend;
       treeNodes(i) := IMPACTNET.TREE_NODE(DIMENSIONKEY || i, 
                                           PARENTNODE || i, 
                                           0, 
                                           0, 
                                           PARASTRING || i, 
                                           0);
    end loop;
END;
/

If that works, you can either leave it as-is, or investigate how to get the return value back in the .NET call.

来源：https://stackoverflow.com/questions/8040115/pls-00306-wrong-number-or-types-of-arguments-in-call-to

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